[Users] Getting CPU idle time of CT outside the CT

[Todd Mueller]

This might be of some help, in the sense of how CPU usage is
calculated. It seems to be accurate from the testing I have done, but
I don't claim to be a professional programmer or have covered all test
cases.

https://gist.github.com/microlinux/0b3f47cb657cb61bb89b

On Tue, Jul 22, 2014 at 12:30 AM, Pavel Odintsov
<pavel.odintsov at gmail.com> wrote:
> It's really nice idea for building CPU load graphics from HWN side.
> Anybody have any ideas do it without vzctl exec... ?
>
> On Mon, Jul 21, 2014 at 10:53 PM, Todd Mueller <toddmueller at gmail.com> wrote:
>> Can you clarify what you are trying to accomplish? Are you trying to
>> identify containers using excessive CPU?
>>
>> On Mon, Jul 21, 2014 at 10:06 AM, Pavel Snajdr <lists at snajpa.net> wrote:
>>> Hello,
>>>
>>> is there any way how to get CPU idle % of CT outside out of the CT?
>>>
>>> We were trying to figure this out from /proc/vz/vestat, first try was to
>>> divide used/idle, but idle seems to be accounted for all available
>>> hwnode CPUs and used seems to be accounted for CPUs available to the CT;
>>> in the end it was giving a pretty reasonable numbers in low CPU load
>>> situations, but when the CT was maxing out its available CPUs, we were
>>> getting 100+% CPU load.
>>>
>>> Next thing we've tried is to look into user,nice and system values, but
>>> there is no idle nor total number of available jiffies to compare to.
>>>
>>> Another thing we've tried is to read /proc/stat from outside of the CT,
>>> but that is a problem, since ve->veid is 0 when running a process to
>>> read out /vz/root/<veid>/proc/stat.
>>>
>>> Solution of a last resort seems to be to run mpstat (or equivalent)
>>> inside of the CT via vzctl exec and watch its output. But that gives me
>>> hundreds of unnecessary running processes - I need to monitor hundreds
>>> of CTs per hwnode. That's kind of a pain :)
>>>
>>> Is there any better way to do this or what am I doing wrong?
>>>
>>> Our kernel is 042stab092.2.
>>>
>>> - snajpa
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>
>
> --
> Sincerely yours, Pavel Odintsov
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